Shuttle-box tension-controlling mechanism for looms



March 6, 1928.

J. NORTHROP SHUTTLE BOX TENSION CONTROLLING MECHANISM FOR LOOMS March 6, 1928.

J. NORTHROP SHUTTLE BOX TENSION CONTROLLING MECHANISM FOR LOOMS 2 Sheets-Sheet 2 Filed March 9, 1925 Patented Mar. 6, 1928.

UNITED sms;

Learnt I A E T mm.

Joins nonrnnor, or rio'rnn'ann, massncnrusnr'rs, nssreivon, #13831 1 reside-1 mm'rs; T0 mmrnit CORPORATION, 01* HOPEDALE, MASSACHUS TTS, A CORPORA- TION OF MAIYIE;

SHUTTLE-BOX TENSION-CONTROLLING MECHANISM: FOR LOOMS iAp plication filed inch 9, 1925, Serial mine.

The present invention relates to an improvement in shuttle box tension controlling mechanism for looms. v v

The ob'ec t of the invention is to reorganize shuttle box tension controlling mechanism for looms in order topsecure an improved operation of the shuttle, and the invention consists. in the mechanism'hereinafter described and particularly defined in the claims. a

In the accompanying drawings"illustrating the preferred form of the invention,

Fig. 1 isan end elevation of a part ofa loom showing the lay 'in section; Fig. 2 1s a front view of the lay oneof the swords and associated'parts; and Fi 3.is a section taken on the line 3-13, ig. 1.

The illustrated embodiment is described as follows: A portion of the loom frame is shown in end elevation supporting the frog 11. As shown in Fig. 1, the front of the loom isat the left of the drawing, and the back of the loom is at the right of the drawing The lay 12 supported by the sw rds'l3 carries the shuttle box indicated in a general way by the reference character 14, the binder 15 being shown in dotted lines. The daggershaft16 is mounted in brackets below the lay beam, and its end 17, bent atrightangles to the body of the shaft, carries the binder finger 18 which in turn carries the binder finger adjusting screw 19 which takesagainst the binder.

Integral with the dagger shaft 16 is the dagger 20 adapted to vengage the steel. 21 of the frog 11. M ounted on the dagger shaft is a bell crank lever 22 which has a downwardly extended arm 23 and a for? wardly extended arm 24. Thisbell crank lever 22 is secured to the dagger shaft by means of three. set screws 25, A second bell crank lever 26 is pivotally mounted l ye 26 is providedlwitha fiat face 32 which engages, the finge lw 3rvlolected right angles from the end of t earm 23 in friont of the face. 32 015 thearm 31, see Fig. '2.

The horizonmrarm 34 of the bell crank lever 26 is connected at its end with the end of the horizontal arm ;24 of the bell crank lever 22 as follows The rod 35 has a right angle portion 136 at its upper end which is received in a hole in the end of the arm 24.

The lower end of the rod 35 passes through the two ears 37 and 38 of the yoke 39, which latter is provided with a pin 40. received in a hole in the end of the arm 34 of the bell crank lever 26. The rod 35 is screwthreaded on its'end, andscrewed upon it is adagger stop 41 which is held in adjusted position by a set n'ut42. This dagger stop is provided with a sleeve 43 integral there'- with s which; embraces the rod 35 and fits with n a hole in the earg38; On the rod 35 above theear 38 is the dagger springadjusting nut 44; adapted to be securedfin' adjusted position by the lock nut 15. The nut 44 is provided with a sleeve 46 which forms a spring seat for the dagger spring 47, which encircles the rod and takes-against the adjusting nut 44-at one end, and against the ear 37at the other end. t i

, Therod 35 attached to the ar'm 24 oper;-

The operation of this mechanism is as follows: \Vhen the shuttlebox is empty the spring 47 exerts its pull upon the rod 35 to thereby turn and hold the dagger 20 def pressed. As shown in Fig. 1 the parts occupy the positions which they assume when the shuttle is standing inthe box, Tbutjwhen the box is empty the dagger is pressed down;

wardly by the spring and occupies a position such that it will engage the steel 21 ofthe frog 11. Whenthe shuttle is about to enter a box it will be understood that thebinder 15 is somewhat tothe left of the position shown in Fig. 1,: being pressed into such position by the dagger finger 18,, and that the dagger shaft 16 is turned owing to this shuttle absence, so thattithe dagger 20 is;

lowered. Now the shuttle strikes the binder:

and throws it violently out. This presses back the dagger finger, lifts the dagger and exerts an upward pull on the rod 35, tending to compress the dagger spring 47. At the same time the downwardly extending arm 23, by reason of the movement of the dagger shaft, moves the vertical arm 31 ot the bell crank lever 26 so as to cause its arm 34 to pull downwardly upon the yoke 39, so that not only is the spring resistance to outward movement of the dagger fingers equal to the compression of the spring by the pull upon the rod 35, but in addition by the pressure super-added thereto of the downward movement of the yoke 39. The blow which the shuttle delivers to the binder being transmitted violently to the dagger finger causes a rapid motion to be imparted to the downwardly extended arm 23 of the bell crank lever 22, and it not only moves the bell crank lever 26, but causes it to overthrow, that is to say, it begins to move it while the arms 23 and 31 are in contact, and then after the arm 23 comes to rest, the arm 31 continues its movement due to its momentum. This results in moving the yoke 39 downwardly until the car 38 comes into contact with the dagger stop 4-1 and the bell crank lever 31 and yoke 39 deliver a blow to the dagger stop which is transmitted through the rod 35 to the dagger shaft andv binder fingers.

The outward movement of the dagger fingers, therefore, under the blow of the entering shuttle, is first resisted by a yielding opposition exerted by the spring -17, and finally terminated by the positive engagement of the yoke with the dagger stop nut 4-1, which delivers a counter-blow to the dagger finger, tending to move it in a direction to cause it to exert pressure on the binder.

This mechanism, therefore, contemplates a means for applying pressure to the binders by which the first blow of the binders against the binder finger is caused to deliver a counter-blow upon the binder finger, tending to turn the latter to engage with the binder owing to the momentum of a part set in motion by the first blow.

The condition of adjustment of the parts is such that the pressure of the binder on the shuttle is small at the time of the pick,

being the light pressure of the dagger spring 1-7. When the box is empty the binder extends the usual distance into the box, but when the shuttle strikes the binder, the binder is prevented from moving outwardly as far as in ordinary constructions of shuttle box binder operating mechanism; that is to say, while the binder is adjusted it will ex tend just as far into the box as is ordinarily the practice, such binder does not move out wardly much beyond the position to which it is necessarily moved in order to permit the shuttle to enter the box, as a result of which the outward overthrow of the binder is not great, and it is promptly returned to press upon the shuttle and resist its entrance by the momentum of a part set in motion by the out and movement of the binder, so as thereby to cause further and greater pressure on the shuutle as it continues its movement in entering the box.

This shuttle box tension mechanism is little afiected by temperature variations, or by variations of humidity, or by the accidental occurrence of oil or moisture on the shuttle. \Vithout this merhanism such conditions sometimes cause shuttles to rebound. but with the present construction a much more continuous pressure is applied to the shuttle as it enters the box, with the result that the rebound is greatly lessened.

One of the features of the operation of this mechanism which is of advantage resides in the fact that because the throw of the binders is reduced, the shuttle is brought to rest more as a result of the continuous application of friction to the shuttle than as a result of the nice balancing of a blow against the part to be moved thereby. That is to say, instead of stopping the shuttle by causing it to strike the binder a severe blow, after which the binder is moved so far that for a certain part of: the entering movement. of the shuttle it is notin contact with the shuttle at all, the shuttle strikes the binder with a much less severe blow, and the binder is out of contract with the shuttle a very much shorter length of time, whereupon contact is resumed, with the result that the frietion applied to the shuttle by the binder is distributed over a longer period of time. This results in a lessened heating of the shuttle, and consequently a lessened wear of the shuttle, and in more uniform operating condition.

The exact mode of operation and the reasons for the satisfactory results accomplished are not. precisely known nor understood, but the foregoing explanation is that which the applicant. believes to be correct.

The bell crank lever 26 is shown as provided with a rcarwardly extended arm 48, having an enlargement or weight 4;!) at its rear end. This may be used if desired, but the description of the operation of the mechanism is the same irrespective of whether this weight be used or not.

Having thus described the invention, what is claimed is:

1. Shuttle box tension controlling mechanism for looms having, in combination, a lay, swords upon which the lay is mounted, shuttle boxes for the lay, binders for the shuttle boxes, pressure applying means for the binders comprising a bell crank lever having a long arm and a short arm pivoted on the sword below the lay, the long arm Fit) ill)

parallel to the sword. and the short arm extended substantially at right angles thereto,

parallel to the sword, and a second arm extended at substantially right angles thereto, a second bell crank lever mounted on the sword having a long arm extended upwardly parallel to the lay and having a face engaging the downwardly extended arm of the bell crank lever on the dagger shaft, said second bell crank lever having an arm extended at right angles to the first arm, and yielding connections between the horizontal arms of the two bell crank levers.

3. Shuttle box tension controlling mechanism for looms having, in combination, a lay, shuttle boxes on the lay, binders in the shuttle boxes, a dagger shaft mounted on the lay provided with daggers and binder lingers, said dagger shaft being provided with horizontal and vertical arms, a bell crank lever pivotally mounted on the lay having horizontal and vertical arms, the

vertical arms of the two levers engaging each other, and the horizontal arms of the two levers being yieldingly connected by a rod and spring contrivance operating as a yielding dagger stop to vary the binder tension so as to increase it suddenly at the beginning of the back stroke of the lay.

4. Shuttle box tension controlling mechanism for looms having, in combination,a lay, shuttle boxes for the lay, binders for the shuttle boxes, pressure applying means for the binders comprising a part which receives the blow of the binder and causes a second part to be set in motion thereby, which second part, due to the momentum derived from such blow, delivers a counterblow to the first part, tending to return it to cause it to apply pressure to the binder.

5. Shuttle box tension controlling mechanism for looms having, in combination, a lay, shuttle boxes for the lay, binders for the shuttle boxes, a dagger, a dagger rod, a dagger spring, a dagger stop, and a part connected with the binders and the dagger stop actuated by the openingof the binders to be thrown against the dagger stop to cause pressure on the shuttle through the binders. 1

6. Shuttle box tension controlling mechanism for looms having, in combination, a lay, shuttle boxes for the lay, binders for the shuttle boxes, a dagger, a dagger rod,

a dagger spring, a dagger stop, and connectmg mechanism acting automatically on the entrance of a shuttle'into a box to impart c momentum to such mechanism to cause pressure to be exerted upon the binders.

7. Shuttle box tension controlling mechanism for looms having, in combination, a I

lay, shuttle boxes for the lay, binders for the shuttle boxes, a dagger, a dagger rod, a dagger spring, a dagger stop, and connections set in motion by the shuttle entering the box to cause the momentum of the connections to again bring pressure upon a the binders.

8. Shuttle box tension controlling mechanism for 'looms having, in combination, a lay, shuttle boxes for the lay, binders for the shuttles boxes, a dagger, a dagger rod, a dagger spring, a dagger stop, and a part set in motion by the opening of the binders due to the entrance of a shuttle into a shuttle box which is thrown by momentum against the dagger stop to cause pressure on the'shuttle through the binders.

9. Shuttle box tension controlling mechanism for looms having, in combination, a

lay, shuttle boxes for the lay, binders for JONAS NORTHROP. 

